"I'm scared of the day I turn 19," the 17-year-old told the paper, "I really don't want to grow past 18... I've done so much, physically and whatever," Kylie added

The Times said Kylie then turned to her 19-year-old sister, Kendall Jenner and said, "You'll be 20 this year - that's crazy. And any second you'll be, like, 21, 22, 23..."

The girls have grown up in the public eye since first appearing on ''KUWTK' in 2007 at the ages of 12 (Kendall) and 10 (Kylie).

Meanwhile, Kendall thinks she grew up too fast. "It's just scary to think how fast everything is rolling and you can't stop it. It's rolling right now. You see a picture and you've changed so much in a year," Kendall said.

As much as the two sisters enjoy more than 20 million following on social media, Kendall says: ''I think social media has taken over for our generation. It's a big part of our lives and it's kind of sad. I hate it sometimes, like, I literally want to throw my phone so I can't look at it. It's all a made-up world if you think about it. Social media, everything, this interview, everything. It's not real. It's pretty crazy."